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a in (-oo:+oo)
(1/2)*a-((1/4)*a) = 9 // - 9
(1/2)*a-((1/4)*a)-9 = 0
(1/2)*a+(-1/4)*a-9 = 0
1/4*a-9 = 0 // + 9
1/4*a = 9 // : 1/4
a = 9/1/4
a = 36
a = 36
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